Everything You Need to Know about Narcissists, Psychopaths, and Abuse - click on this link: http://www.narcissistic-abuse.com/faq1.html
Personal boundaries are rules of conduct, red lines in the sand any infringement and breach of which you deem unacceptable behavior. You need to set your boundaries clearly, unequivocally, and unambiguously firstly to yourself: how to protect your dignity, privacy, freedom, and priorities. You then need to communicate your boundaries to your partner replete with a "price list": the costs associated with ignoring or violating them. Finally, you need to be firm and enforce your boundaries: your credibility depends on a consistent and fair application of these rules of engagement.
(From the book "Malignant Self-love: Narcissism Revisited" by Sam Vaknin - Click on this link to purchase the print book, or 16 e-books, or 3 DVDs with 16 hours of video lectures on narcissists, psychopaths, and abuse in relationships: http://www.narcissistic-abuse.com/thebook.html)